i cannot mention the game that this game is based on but you should probably figure it out easily, im making a game where your playing the guitar and theres a proc for each of the 5 notes, the notes are at random unlike the game this is based on thus im using the procs...

What you want is a system of states.
You want to tell it that "these buttons are on."
Then you would execute a function that would check which buttons have been "enabled", and do something with that information (for example, check if the green button has been switched on, and if it has, check if a green "note" is up next on the "fretboard" of the "guitar". if it is, play the "note" and give them points).